Concerned with software or hardware firewalls

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65 views

Is there a trusted independent firewall review company?

I don't know how to write this without it sounding like a plug (lol), but it's not. So please don't close-vote it, even if you really want your editor badge. Here goes: There's this site called ...
2
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1answer
56 views

Should reverse connections be used to bypass NATs?

I'm planning on doing a demonstration on how remote administrative tools work for my schools computer security club. I plan on writing a RAT in C++ and demonstrating/explaining how it works. I ran ...
2
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1answer
86 views

Is it possible to track the email sent via BCC List using firewall or network security software?

I want to know whether is it possible to know the conversation/email sent via BCC can be identified by admin in some corporate companies? I have heard that email sent from BCC cannot be identified, ...
2
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1answer
326 views

IPS/IDS and Firewall Solution(s) to a Small Office

I was tasked with implementing a network security solution for a small real estate agency. They are a typical old-school mom and pops shop, about 15 employees with basic file sharing, printing, and ...
2
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1answer
89 views

Setting up NAT with firewall for RDP connection

I have a vendor who needs to connect remotely to one of our servers. What I thought I would do is setup a NAT rule in our firewall. I have a public IP address that I will have translated to the local ...
2
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2answers
569 views

Mixing stateless and stateful firewall rules

I have been advised that mixing firewall rules that are both stateful and stateless can lead to trouble when it comes to troubleshooting. Is there any truth in this? Take the following two rule sets ...
2
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2answers
275 views

Barracuda antispam access to active directory in dmz : opening port or not?

I have a Barracuda Antispam unit and look to use recipient validation with active directory to stop sending NDRs (non-delivery reports) when we are being spammed. What I see on the web is people ...
2
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1answer
249 views

Normalizing Windows Advanced Firewall rules

How can I best normalize our Windows Advanced Firewall rules while implementing network segmentation? I want them to be as clear and concise as possible for audit purposes. What few examples I've seen ...
2
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1answer
95 views

Quick Security Mitigations to Impending attacks

Suppose you are the sysadmin, and you know of an impending attack that just started or about to start soon. You can either wait it out, or try a few tricks and quick mitigation to fend off attackers ...
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2answers
366 views

How to define different firewall rules for different users on the same machine running on Windows 7?

Provided that one machine running on Windows 7, connected to LAN, and connected to the Internet via a gateway in the LAN. There are two logon user accounts A and B on the machine. I want: 1, User A ...
2
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2answers
484 views

Does an equivalent for netconf exist in the Cisco ASA world?

I'm looking for a method to send instructions to a Cisco ASA without writing scripts to execute on the CLI over SSH. Cisco doesn't seem to support netconf or xml-pi on the physical ASAs (only their ...
2
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1answer
5k views

How to block all access to Akami deploy servers and Apple push servers?

I no longer blindly trust the numerous connections that occur at night and during the day that always go to "content" and "push" servers like: a23-33-37-54.deploy.akamaitechnologies.com ...
2
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1answer
248 views

IDS/WAF scenario for 2 web servers

I'm running 2 web servers on 2 different physical hosts at home. They handle both HTTP and HTTPS traffic. I want to protect against web application attacks, but don't want to spend money for ...
2
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1answer
493 views

Large lan party : How to identify the users on the network?

I would like to know what are the good way to identify users on a large lan party when you manage network ? I had the idea to make the users register them self at a desk, they give us Firstname, ...
2
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1answer
164 views

Firewall Considerations with PGP Universal

The PGP Universal server is a fairly complex piece of work that provides several different services. When constructing firewall rules I am trying to determine what implications there are for opening ...
2
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1answer
2k views

Something causing Sonicwall to throw Smurf Amplification Attack Warning?

I set up a new laptop recently and, after installing various developer tools, it started causing our Sonicwall firewalls to issue an alert email whenever the laptop connected to the network. The ...
2
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1answer
2k views

How should I configure a Citrix Netscaler to protect against HTTP, TCP, or UDP flood attacks?

I have a Citrix Netscaler and want to configure the appliance appropriately so that it can protect my hosts from a DDOS. Is this something I can do here, or must I take action on the host itself?
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3answers
1k views

Use a Common Firewall for two Different Subnets

I want to implement a security scheme in a new network configuration. There are two buildings for the client: Office Building 1 (OB1) with address 10.0.0.0 / 255.255.255.0, Gateway 10.0.0.1 ( ...
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2answers
320 views

What compliance framework is appropriate for firewalls

As a more corpose vulnerability assessment and penetration test, one step of our activity is to review from a security perspective the policy of some firewall. In our society we have a deep ...
2
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1answer
96 views

How to block traffic coming from an “public” WiFi hotspot and going to the LAN (iptables)

I followed this tutorial (http://elinux.org/RPI-Wireless-Hotspot) for an Wifi Hotspot in the guesthouse. This is working fine, but every device on the WiFi network can reach any LAN device in the LAN ...
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0answers
150 views

cisco asa syn flood detection and response not working

I have a Cisco ASA 5510 (ASA Version 8.3(2)) that has been getting a syn flood attack on it (or more accurately through it - targeting a host behind it) a couple of times a day for the past few days. ...
2
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2answers
137 views

How common is port-knocking? [closed]

Today I read about port-knocking for the first time. It has been a pretty known concept for more than ten years, but I don't know anybody who uses it for their servers. How common is the usage of ...
2
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1answer
60 views

How do you back up cardholder data remotely without a network connection?

In the PCI DSS version 3 it says: 1.3.3 Do not allow any direct connections inbound or outbound for traffic between the Internet and the cardholder data environment. But in the event of hard ...
2
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2answers
254 views

ASA5505 DMZ issue

I have ASA5505 , connected to the WAN on port 0 (called Vlan2), and connected to my development LAN on port 7 (Called Vlan1). I want to add DMZ, and I connected switch and servers to port 3, and ...
2
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1answer
377 views

How to configure Suricata to not interfere with virtual machine

I'm currently planning on setting up Suricata as a firewall on my laptop. I'm wondering however if it's possible to set Suricata to not interfere with traffic to and from specific virtual machines ...
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0answers
107 views

Shorewall stopped policies - routeback

Here goes a very specific question about the insides of Shorewall and Iptables in general. Shorewall supports configuration of "Stopped Policies" using the file routestopped, which defines the ...
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0answers
50 views

Could you attack a port without knowing what service was listening? [duplicate]

A lot of discussion I see suggests that changing default ports for services is just "security by obscurity" and is easily defeated by scanning for open ports. My question is this, though, if the ...
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2answers
2k views

What justification is there for Comcast to block SMTP port 25 outbound from residential service?

Within the last week, Comcast seems to have started blocking port 25 outbound from their residential internet service. I can sort of understand why they might justify blocking it inbound as perhaps ...
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5answers
515 views

How do a firewall's rules for individual programs work?

I kind of know that how a firewall's rules for IP/port work, but I have no idea how a firewall deals with individual programs. In other words, how does the firewall know a program wants to access the ...
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4answers
31k views

How to effectivily block torrents on my network?

Hie, As per my network policy, we have to block all torrent traffic from network. To do this, I used to block all ports above 1024 on my firewall/proxy devices. But due to this, many other ...
1
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1answer
174 views

Is a firewall an access control list?

I want to know if a firewall is considered an access control list (ACL). I know there are other types of ACLs, but am specifically interested in knowing if a firewall is an ACL. Edit: It appears ...
1
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2answers
5k views

How secure is blocking all incoming connections on my ADSL or cable router?

My router, an up-to-date ADSL Fritz!Box 7340 router with a fixed leased IP address, has been configured to block all incoming traffic. Assuming, for the sake of argument, no extra security is ...
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3answers
166 views

hardware firewall placement

In a home office environment with cable internet, can a hardware firewall be placed in front of/upstream from a cable modem to also protect the modem from tampering by the isp or a hacker?
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2answers
184 views

How to restrict access to unwanted sites?

I use Ubuntu 13.10. I tried to used OpenDNS to restrict some websites. Unfortunately, I couldn't do that. I use AirStream 1200 USB modem to access WiMax internet. OpenDNS setting didn't work for me at ...
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3answers
5k views

windows firewall turns OFF automatically

It seems pretty weird but for some reason, the Windows 7 firewall turns off. After I turn the firewall on in the control panel, it seems that it turns itself off when I go back to the control after I ...
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2answers
3k views

IPTables default security rules for a gateway/router?

On a router such as dd-wrt or tomato, what would be some default iptables rules? I am asking for rules on a router/gateway - For example; blocking SYN flood attacks, or XMAS attacks. The basic ...
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2answers
229 views

Do I need a hardware firewall even if I have Internet security software?

I have Kaspersky Internet Security 2010 installed on my Win7 computer. I assume it gives me enough protection for a software firewall(port security,tracking tcp,udp traffic etc.) Do I still need a ...
1
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2answers
2k views

How to check if a port can be accessed from the outside

I want to be sure that the firewall protecting the intranet is effectively rejecting/granting access to a port. I have no access to the firewall nor any other external machine. Is that possible at ...
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3answers
513 views

Testing Web Application Firewall Configuration (ModSecurity)

What is the best way of testing my Firewall configuration as i have deployed the Core Rule set provided by the OWASP. But my rule configuration was giving me too many false positives which i resolved ...
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2answers
74 views

Is rolling my own firewall on top of my normal firewall dangerous?

I'm thinking about playing with/learning about firewalls. It is easier for me to learn by building, so why not build a firewall? If I run it alongside my normal firewall, I'd get the normal ...
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3answers
2k views

How to setup an internal firewall

I'm hoping to get some advice on a project I've been asked to look after at work. I do all of the IT for a small company that sits inside of a larger corporation. We need to prevent access to ...
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2answers
223 views

Which encryption technique should be used for cloud computing data transfer?

I want to setup my application for cloud computing for Software as a Service. There is going to be a lot of data transfer between my server and client, to and fro. The technique I have envisaged is: ...
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5answers
168 views

Firewall rules by URL

is there a solution to create FW rules by URL instead of IP for inbound traffic? For example a.example.com and b.example.com are the same IP on the DNS, but they are different sites, is there a ...
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2answers
591 views

How to prevent attacks to server

I have 3 CentOS server configured for my applications. Recently I recognized that there is so many attacks to my servers. I have so many logs about attempt to login to my servers using sshd from ...
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5answers
210 views

Do firewalls always run in userspace?

There are many Firewall solutions for the world on different operating systems: iptables, pf, ipfw. My question is: Does the firewalls run in kernel-space or all of them runs in user-space? (in ...
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2answers
346 views

how to find out if a program sends data to internet (without permission)?

We have an application to save our customers data (some kind of CRM). This application has been written in Delphi and is a client/server application. This program apparently is sending out ...
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1answer
353 views

Assuming no MITM, is Gmail communication 100% secure and private?

I sometimes have to use my personal Gmail account from my company workstation, where I know for fact they are using content-aware firewall(s) like Palo Alto, and potentially other nasty things like ...
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3answers
1k views

Best practices for firewall hardware

I'm planning to implement a linux based firewall/router with at least 6 x 1Gb NIC's (network with ~300 computers/server with >=8 VLANs) Can anybody recommend hardware best practices (reference to ...
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4answers
1k views

Connections through Firewalls explained

I'm looking for a good explanation of how connections work through firewalls. I've got the idea of packaging(encapsulating) some protocol inside another one as its payload when tunneling. But what I ...
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2answers
144 views

Looking for a taxonomy of web attacks

I am working on semantic representation of firewall rules but could not find a good taxonomy of Web attacks in terms of HTTP protocol. I do find web attack classification i.e XSS attack, SQL attack.